Is this a square matrix? Why or why not? 
Definitions:
Positron-emission Tomography
A nuclear medicine functional imaging technique used to observe metabolic processes in the body as an aid to the diagnosis of disease.
Biochemical Activity
The chemical processes and reactions that take place in living organisms.
Electroencephalogram
A test that measures electrical activity in the brain using small, flat metal discs attached to the scalp.
Neural Activity
The functioning of neurons, including the transmission of electrical and chemical signals within the brain and nervous system.
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